.chat {
  width: 100px;
  height: 60px;
  border-radius: 10px;
  background-color: skyblue;
  position: relative;
  left: 70px;
}

.chat:before {
  width: 0;
  height: 0;
  border-right: 30px solid skyblue;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  position: absolute;
  content: '';
  left: -30px;
  top: 50%;
  transform: translateY(-50%);
}
